LOCATION HAFUL CATentative Series
TAXONOMIC CLASS: Fine-loamy, parasesquic, mesic Typic Haploxerults
TYPICAL PEDON: Haful very gravelly sandy loam, forested, on a 9 percent NNE facing slope under white fir, sugar pine, Douglas fir, ponderosa pine and incense-cedar at 4,640 feet elevation. (When described, October 31, 1989, the soil was dry below 8 inches. Colors are for dry soil unless otherwise noted).
Oi--1/2 inch to 0; recent and decomposing fir needles, twigs and other litter; abrupt wavy boundary.
A--0 to 2 inches; brown (7.5YR 5/2) very gravelly sandy loam, very dark brown (7.5YR 2/2) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine roots; common very fine interstitial pores; 45 percent pebbles; slightly acid (pH 6.1); clear wavy boundary. (2 to 4 inches thick)
BA--2 to 8 inches; reddish brown (5YR 5/4) very gravelly sandy loam, reddish brown (2.5YR 4/4) moist; weak very fine and fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and common medium roots; many very fine interstitial pores; 45 percent pebbles; moderately acid (pH 5.9); clear wavy boundary. (3 to 9 inches thick)
Bt1--8 to 14 inches; reddish brown (5YR 5/4) gravelly sandy clay loam, red (2.5YR 4/6) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, sticky and plastic; many very fine and fine, common medium and few coarse roots; common very fine tubular pores; common thin clay film on peds, in pores and bridging mineral grains; 25 percent pebbles; moderately acid (pH 5.8); clear wavy boundary.
Bt2--14 to 22 inches; yellowish red (5YR 5/6) gravelly clay loam, red (5.YR 4/6) moist; moderate medium and coarse subangular blocky structure; hard, very friable, sticky and plastic; common very fine and fine roots; common very fine tubular pores; common thin and moderately thick clay films on peds and in pores; 20 percent pebbles; moderately acid (pH 5.5); clear wavy boundary.
Bt3--22 to 48 inches; reddish yellow (5YR 6/6) gravelly clay loam, strong brown (7.5YR 5/8) moist; moderate medium and coarse subangular blocky structure; hard, very friable, sticky and plastic; common very fine and few fine roots; common very fine tubular pores; common thin and few moderately thick clay films on peds and in pores; 20 percent pebbles; strongly acid (pH 5.4); clear wavy boundary. (the combined thickness of the Bt horizons is 39 to 45 inches)
Crt--48 to 62 inches; soft weathered meta andesite; massive; few roots only in pockets; very hard, firm; common moderately thick red (2.5YR 4/6) moist clay films along some fractures; 5 percent hard volcanic gravel size.
TYPE LOCATION: Plumas County, California; located about 3 miles SW of Humbug Valley; 1100 feet N and 4000 feet E of the SW corner of Sec. 13, T.26N., R.6E. Belden Quandrangle.
RANGE IN CHARACTERISTICS: Depth to the paralithic contact ranges from 40 to 60 inches. Base saturation ranges from 10 to 40 percent and decreases with depth. Organic carbon ranges from 7 to 9 kg/m2 to a depth of 100 cm. The mean annual soil temperature varies from 47 to 50 degrees F. The soil moisture control section (8 to 22 inches) is dry from mid July to mid October and is moist in all parts from early December to mid May. The soil temperature exceeds 41 degrees from mid April to early December and exceeds 47 degrees F from mid May to mid November.
The A horizon is 7.5YR 5/2 or 5YR 5/4. Moist color is 7.5YR 2/2; 5YR 4/3 or 4/6. It is very gravelly, very stony or very bouldery. Reaction is moderately or slightly acid. Base saturation ranges from 20 to 40 percent.
The BA horizon is 5YR 5/4, 5/6 or 2.5YR 5/6. Moist colors are 5YR 4/4 or 4/6. It is 15 to 20 percent clay and 20 to 50 percent gravel. Reaction is strongly or moderately acid. Base saturation ranges from 10 to 30 percent.
The Bt1 horizon is 20 to 25 percent clay. Reaction is strongly or moderately acid.
The Bt2 and Bt3 horizons are 5YR 5/4, 5/6, 5/8, 6/6, 6/8 or 2.5YR 5/8. Moist colors are 7.5YR 5/8; 5YR 4/6, 5/8; 2.5YR 4/6 or 4/8. It is 27 to 35 percent clay, 25 to 50 percent sand and 20 to 30 percent gravel. Coarse and very coarse sand ranges from 5 to 15 percent. Reaction is very strongly through moderately acid. Base saturation ranges from 10 to 30 percent. Percent iron as extractable iron oxide commonly is 5 to 10 percent, but ranges up to 19 percent.
COMPETING SERIES: These are no other series in this family.
GEOGRAPHIC SETTING: Haful soils are on mountain back slopes. These soils formed in material weathered from andesite or metavolcanic rock. Slopes are 5 to 50 percent. Elevation ranges from 4,300 and 5,200 feet. The climate is subhumid with warm dry summers and cold moist winters. The mean annual precipitation is about 35 to 45 inches with 40 to 70 inches of snow. The mean annual temperature is about 48 degrees F the mean July temperature is about 66 degrees F, and the mean January temperature is about 30 degrees F. The frost-free period is 80 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Keddie, Kinkle and Windy soils. Keddie soils have a mollic epipedon. Kinkle soils are very deep and loamy-skeletal. Windy soils have umbric epipedons and are frigid.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow to medium; moderately slow permeability.
USE AND VEGETATION: Haful soils are used for timber production. Vegetation is white fir, sugar pine, Douglas fir, ponderosa pine and incense-cedar.
DISTRIBUTION AND EXTENT: Plumas County, CA. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES PROPOSED: Plumas County, California; Plumas Supplemental Area, Parts of Lassen and Plumas Counties, Soil Survey Area, 1990.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the mineral soil surface to a depth of 2 inches (A horizon)
Argillic horizon - the zone from 8 to 48 inches (Bt1, Bt2, Bt3 horizons)
Paralithic contact - the boundary at 48 inches. (Crt horizon)